Write README to .mortar-local directory
Set pig project root param and environment variable for python
Code review changes
Merge pull request #208 from mortardata/jkarn_mortar_local_readme_2

[#73798744] Write README to .mortar-local directory
Merge pull request #209 from mortardata/jkarn_project_root_param

[#73798946] Set pig project root param and environment variable for python